Karl R. Cannon is a Registered Patent Attorney and a founding shareholder in the Salt Lake area law firm of Clayton, Howarth & Cannon P.C., specialists in patent, trademark and copyright law. He may be contacted at 801-255-5335 or by e-mail at kcannon@chcpat.com. Copies of patents are available by mail for $3 each from U.S. Patent and Trademark Office, Box 9 (Copy Sales), Washington, DC 20231; by credit card via telephone 703-308-9726 or toll free 800-972-6382; facsimile 703-305-8759; or e-mail ptcs@uspto.gov. Patents can also be viewed and printed free of charge from several Internet sites, including www.uspto.gov or www.delphion.com.